Metal working machine



9 R. 5. BROWN METAL WORKING MACHINE 4 Sheets-Sheet 1 Original Filed Oct.12. 1926 I INVENTOR 5. :2 WWW BY L 2W 0W] MM ATTORNEY') Jam. 3, 1933. R.s. BROWN METAL WORKING MACHINE Original Filed Oct. 12, 1926 4Sheets-Sheet 2 i a i 3 pm egg ATTORNEYS Fan. 3 1933. 5, BROWN LQQZQZQMETAL WORKING MACHINE Original Filed Oct. 12, 1926 4 Sheets-Sheet 3 L f49 IL If" INVENTOR 3 F L ATTORNEY$ Jam 3,, 1193. R. 5. BROWN METALWORKING MACHINE Original Filed Oct. 12, 1926 4 Sheets-Sheet 4 lNVE/IiTORw 5. @fiQ /www AORNEY5 Patented 1.... 3, 1933 PATENT OFFICE ROBERT S.BROWN, 0] NEW BRITAIN, CONNECTICUT, ASSIGNOB, BY ASSIGN- MENTS, TO THENEW BBITAIN-GRIDLEY MACHINE GOMPANY PDF NEW- BRITAIN, CONNEGTIOUT, ACORPORATION OF CONNECTICUT I METAL sca s mourns Application med October12, 1926, serial in. 141,118. Renewed Iarch 2, 1932.

I My invention relates to a metal working machine, and is particularly,though not exclusively, adapted for incorporation in a multiple spindlebar machine, wherein operations are performed simultaneously on workcarried by each of a plurality of spindles.

In both .single and multiple spindle machines of the characterindicated, itis at the present time usual to feed a certain length ofstock forward,then chuck the stock, then perform the desired operationsupon the stock, after which the, stock is unchucked and another lengthfed forward. Thefeeding of the stock and chucking and unchucking areusually performed by cam means. vThe cams are arranged in a certaindefinite relation to the means, usually a cam, for actuating the toolsso that the tool operatidns may be performed while the stock is chucked.

Heretofore, when it was desired to feed a longer length of stock, it hasbeen usual to change the normal stock feed cam arrangement so as toprovide a cam of greater throw for feeding the desired length of stock.So changing the cams was a time consuming and often difiicult operation.1

It is the principal object of the present invention to provide simplemeans for increasing the range of length of stock which may be actedupon by increasing the length of stock fed for each cycle of themachine.

It is a more specific object to provide simple,

sturdy means for varying the speed of chucking and feed cams in relationto the main cam shaft of a machine of the character indicated, wherebylonger or shorter lengths of stock may be fed without changing thenormal camming of the machine.

Another object is to provide a stock feeding'means continuouslyconnected to the main cam shaft and driven thereby at a variable rate ofspeed relatively to the shaft to accelerate the feeding movement of thestock feeding means.

Finally, the object is to provide an improved stock feeding mechanismwhich will act to rapidly yet smoothly feed the stock.

Briefly stated, in the preferred form of the invention, I employ a maincam shaft for actuating a tool slide andalso for actuatin the stock feedand chucking cams in de 'te timed relation to the rotation of the main 7cam shaft. The chucking and feed cams are preferably mounted upon ashaft separate from the main cam shaft but actuated by the A the maincam shaftto the auxiliary cam shaft through the medium of gearing whichserves to accelerate the action'of the feed and chucking cams so thatWork stock will be fed and chucked and unchucked twice durin each cycleof the machine. This double feeding, double chucking and-doubleunchucking 1s preferably done in substantially the same space oftime during a cycle of the machine as is requiredfor a normal singlechucking,

a cycle. r

In the drawings which show,f'o r illustrative purposes only, a preferredform of the invention as applied to a metal working machine specificallyof the multiple spindle bar machine type Figure 1 is a longitudinal viewin partial section of a multiple sp' dle bar machine and illustratingfeatures of the invention;

Fig. 2 is an enlarged, sectional view through parts shown at the lefthalf of Fig; 1

Fig. 3 is an enlarged, fragmentary view in partial section of changespeed mechanism illustrating the invention;

Fig. 4 is a view in end elevation of parts shown in Fig. 3; 7

Figs. 5 and 6 are diagrammatic develop ments illustratin the angularrelation and sequence of certain operations;

Fig. 7 is a diagrammatic view illustrating the angular relation andsequence of certain operations.

In said drawings, 1 indicates the mainframe or base of a multiplespindle bar machine carrying a spindle'cylinder 2, in this instance ofthe stationary type. A plurality of rotatable spindles 3--3 are mountedin the single feeding and single unchucking during Ii The drive shaft 6carries a gear 7, meshing with a gear 8 on the main drive shaft 9. Uponrotation of the main drive shaft 9 through suitable means, such as apulley 10,

10 the shaft 6 will be rotated, and throu h the gears 5 and 4,the-spindles, which are adapted to carry the bar stock such as 11, arerotated.

The stock 11'is fed forwardly, that is, toward the right as viewed inFig. 1, by suitable means to be hereinafter described, and up to a workstop 12 carrying anti-friction devices 13-13 for arresting the feed.This work stop 12 may be moved up to and held in the desired position,and the stock fed up against the work stop and then chucked in thespindles. The work stop may then be withdrawn out of the wa beforethetools act upon the projecting en s of the stock.

In the orm shown, the work stop is moved by cam means, such as 14, on acam drum 15. The shaft 6 serves to drive the cam drum 15 through a gearmechanism, as shown in Fi 1. A pinion l6 meshes with the spur gear 1which is on a suitable quill, which also carries the gear 18. The lattergear drives the gear 19 on a quill carrying a second gear 20, which inturn meshes with a gear 21 on the clutch shaft 22. The clutch shaft 22carries a pinion 23, meshing with an internal gear 24 within the camdrum 15. Therefore, upon rotation of the main drive shaft 9, the camdrum 15 will be rotated. During the rotation of the cam drum 15, theslide 25 carrying the work stop 12 is moved up to and held in thedesired position by the cam 14 and the work stock is then fed againstthe stop. After the work stock has been chucked, continued rotation ofthe cam drum 15, through cam means, serves to retract the stop 12 andleave the stock in properly chucked position.

The cam drum 15 in the present instance serves to drive the main camshaft 26 direct ly. This main cam shaft may actuate a tool slide 27through the medium of an arm 28 engaged by a cam 29 carried upon themain cam shaft. The position of the cam 29 is such that the tool slidecarrying the desired tool or tools, is moved into operative positiondurin the time that the stock is held in chucked po-" sition. The maincam shaft 26 serves to actuate a feed cam 30 and a chucking cam 31carried respectively upon drums 30'31.

Each spindle (Fig. 2) may carry a chuck 32 of such construction thatwhen the chuck is drawn rearwardly through the medium of the chuck tube33, stock in the chuck will be securely held. The bar stock 11 is fedforwardly by spring fingers 34 carried by the feed tube 35. The feedtube 35 is reciprocated by a spider36 cooperating with the spool 37 ohthe feed tube. The spider 36 is carried upon a slide 38, which in turnis actuated in one direction by the feed cam 30 and in the reversedirection by a suitable cam or cams, not shown.

The stock is chucked, as stated, by drawing the chuck 32 toward the leftas viewed in Fig. 2. This is accomplished in the instance shown byfingers 3939 carried upon the end of a chuck tube 33 -and acting againsta part of the spindle 3. The chuck fingers 3939 are spread by means of acone 40, which is in turn actuated by a spider 41 carried upon the drawrod 42, which is in turn reciprocated by means of a lever 43v coactingwith cams-such as 31 on the chucking drum.

Machines as thus far described, in which the drums carrying the cams30-31 are fixedly mounted upon a main cam shaft such as 26, are now wellknown in the art. The illustrative embodiment of my present inventionhas to do particularly with the connection and operative relationbetween the main cam shaft 26 and the drums-3031' carrying the feed andchucking cams 30-31.

In the form shown, an auxiliaryeam shaft 45 is mounted in a suitablebearing and is preferably in alinement with, but at times rotatablerelatively to the main cam shaft 26. As shown particularly in Fig. 2,the cam drums 30--31 are fixedly-secured upon the auxiliary cam shaft45. During what maybe termed the normal operation of the machine when asingle length of stock is to be fed forward for each cycle of themachine, I prefer to connect the main cam shaft 26 and the auxiliary camshaft 45 to each other so that they rotate together. The machine thenoperates as machines of the prior art, in that the chucking and feedcams are in effect mounted directly upon the main cam shaft. In the formshown, I may connect the cam shafts 26 and 45 for directdrive asfollows:

The auxiliary cam shaft is provided with a long spline key 46, whichfits a corresponding keyway in a sleeve 47 so that the sleeve 47 isconstantly rotatable with the auxiliary cam shaft 45. The sleeve47'carries a pinion 48, for a purpose to be described. The main camshaft 26 may have a key 49 thereon, so that when the sleeve 47 is slidalong the auxiliary cam shaft 45, the keyway in the sleeve 47 Will fitover the key 49, and both shafts 26 and 45 will rotate as a unit. Thepositions of the sleeve 47 and pinion 48, when the shafts 26 and 45 arerotatable together, are shown in dotted lines in Fig. 3. The sleevewould ordinarily be secured in such position by inserting a pin, such as50, through the hole 51 in the end of the sleeve 47, and through arectly connected to ether. The sleeve 47 is preferably held in t e fullline position also y means of the pin 50 extending through registeringapertures in the sleeve and auxiliary cam shaft 45. Now, when the shafts36 and 45 are held so as to be rotatable as a unit (dotted line positionin Fig. 3), theaction of the machine will be as follows Rotation of themain drive 9 will cause the spindles to be rotated as heretoforedescribed. The cam drum 15 will be rotatedso as to cause the cam 14 toposition the work stop 13 in the desired position to stop the ends ofthe bar stock 11 in the various spindles. The cam drum 31 will berotated so as to cause the cam 31 to release the clutch 32. The feed cam30 on the feed cam drum 30' will then cause the slide 38 to move towardthe right as viewed in Fig. 2, and through the spring fingers 34, willcause the stock 11 to be fed forwardly an appropriate distance. If thethrow of the cam 30 is sufficient, the stock 11 will abut the work stop12 and further movement of the spring fingers 34 will simply cause thelatter to frictionally slide along the stock. Continued rotation of themain cam shaft will cause the chucking cam, such as 31, to move the drawrod 42 toward the left into the position shown in Fig. 2. and cause thecone 40 to separate the chuck fingers 39 and cause the stock 11 to bechucked. After the work is chucked, the cam 29 serves to actuate thelever 28, which in turn actuates the tool slide to ad- .vance the toolsto the work and perform the desired operations thereon. Preferably thework stop 13 is withdrawn prior to the end of the forming or cutting offoperation performed on the work stock. Thereafter a cam, such as 31, onthe chucking cam drum 31' moves the draw rod 42 toward the right andunchucks the stock 11, and another length is fed forward, as described,the feed tube having been drawn back for a new length while the stockwas chucked. One cycle of the machine, therefore, may be said to befeeding a length of stock forward, chucking the same and performingoperations on the chucked stock, drawing back the feed fingers, and thenunchucking the bar stock. The normal camming of the machine causes onelength of stock to be fed forward and chucked and unchucked once duringeach cycle of the machine. Now, if a greater length of stock is desired,it would ordinarily be necessary to change the cam or cams on the feedcam drum 30' so as to feed the requisite length. In some cases, it mighteven be that a new cam drum would have to be put in place in order tohave the requisite length of stock fed. By means of my presentinvention, I am enabled to feed more than one length of stock during acycle of'themachine, and, as specifically shown. twice the length ofstock that is permitted by the greatest feed of the feed cam undernormal conditions. This desirable result is effected in the preferredform of the invention by rotating the auxili- 'ary cam shaft at a higherspeed than the cam shaft 26 so that more than one feed, chucking andunchucking takes place during a cycle of the machine. It is thereforepossible to cause work to be chucked and unchucked more than once'duringeach cycle of the machine, and more than one length of stock may be fedduring the same cycle of the machine, and all of these operations may becaused to be performed during substantiall the same time that a singlelength of stock is fed forward under the normal operation of themachine.

As a preferred form of mechanism for causing the machine to feed morethan one length of stock forward during a cycle of the machine, I mayemploy a system of gearing as follows:

The main cam shaft 26 has keyed thereon a gear having teeth at differentdistances from the center of rotation, such as the elliptical gear 55.This gear may mesh with a corresponding gear 56 carried by acountershaft 57 mounted upon the frame of the vmachine. The ellipticalgear 56 may be secured to a quill 58 carrying a spur gear 59,

which in turn meshes with the pinion 48 on the sleeve 47 when the latteris in full line position as shown in Figs. 2 and 3. In the particulardesign illustrated, the gear 59 has twice as many teeth as the gear 48,and consequently one revolution of the gear 59 will cause the pinion 48and the auxiliary cam shaft 45 to revolve twice. Now, upon one completerevolution of the main cam shaft 26, it will be clear that, through thetwo elliptical gears and the two spur gears, the auxiliary cam shaft 45will be caused to make two revolutions but, due to the eccentricallymountedgears, the rate of angular travel of the auxiliary cam shaft 45will be variable.

It will be clear that with gears 48- 59 of a different ratio, forexample, a ratio of 1:1, the shaft 45 will make one revolution for everyrevolution of the shaft 26, butthe angular speeds of the two shafts willbe variable, due to the variable speed mechanism, such as gears 55- -56.This variable rate of rotation with the gear ratio shown permits me toaccomplish a double chucking, a double feed of stock. and a doublechucking during one cycle of the machine or, as herein specificallyshown, during one complete rotation of the main cam shaft 26, and thesedouble functions may be accomplished in substantially the same period oftime during a cycle as the single unchucking, single stock feed andsingle chucking of the stock during the so called normal operation ofthe machine.

A particular design ofmachine which has proven entirely satisfactory inpractice is operations upon the chucked stock. During the time the stockis chucked and operations are being performed upon the chucked stock,

the feed fingers 34 are drawn back so as to grip a new length of stockfor the next stock feed. Due to a variable speed device of the typeillustrated particularly in Figs 3 and 4, I am able to effect the doubleunchucking,

double stock feed, and double chuckingduring substantially 156 of therotation of the main cam shaft, thus leaving substantially 204 of therotation of the main cam shaft for the performance of tool operations onthe chucked stock;

These functions havebeen graphically illustrated in Figs. 5, 6 and 7 inrelation to one revolutionof the main cam shaft 26. Upon referring tothese figures and the previous reference to the machine which wasdesigned to unchuck, feed and chuck once during a cycle of the machine,it will be plain that during the so called normal operation, a singleunchucking, a single stock feed, and a single chucking may be performedwithin a certain definite portion of the angular rotation of the maincam shaft, in this case during substantially 156 of such rotation. Thestock then remains chucked for substantially 204 and the feed fingers.are drawn back during this 204. By providing a variable speed device,such as is illustrated particularly in Figs. 3 and 4, the work stock maybe unohucked during 21 of the rotation of the main cam shaft 26, stockmay be fed during the next 26 and the fed stock may then bechuckedduring the next 10 and may remain chucked during the next 42,during which latter period the feed fingers are drawn back to get a newlength of stock. The stock is unchucked during the next 10. During thenext 26, a second length of stock is fed forwardly, and during the next21 the last chucking operation during .a cycle is performed. Then,during the next 204 of the rotation of the main cam shaft, the doublefed length of stock remains chucked, and during this 204 rotation, thefeed fingers are drawn back for a new length of stock. This wouldcomplete one cycle of the machine.

Fig. 5' graphically illustrates the foregoing actions and relations ofunchucking and chucking the work stock, and reading directlyfrom Fig. 5onto Fig. 6, the stock feeds and drawbacks are indicated. Figs.

5 and 6 indicate what may be termed developwhile Fig. 7 indicates thesesame actions or relationships angularl It will be seen that byconnecting the two shafts 4526 through variable s eed gearing thefeeding movement of the eed means, such as the feed cam, may be greatlyaccelerated, so that a long, smooth cam may be feeding portion of itstravel and will be retarded during the remainder of the cycle.

One specific design has, been herein disclosed. Other designs providingfor- 'a' greater or less time for performing tool operations on thechucked stock may be made.

I do not wish to be confined 'to the use of elliptical gears since othervariable types of connection are contemplated within the scope of theinvention.

The invention has been herein specifically disclosed as embodied in amultiple spindle bar machine, but it will be plain that the number ofspindles employed is not of the essence of the invention, and theinvention is applicableto a machine having one or more spindles. v Thespindles may or may not be rotatable. The invention has further beendescribed in connection with a metal working machine, and has been sodesignated, but the principles of the invention are of broaderapplication, and I do not wish to be confined to a metal workingmachine.

I do not wish to be confined to the particular mechanical expedientsherein specifically described for I wish to include any and all meanswithin the scope of the claims for feeding either one or more lengths ofstock without change of normal camming, and more particularly so whenthese operations are performed during substantially the same time that asingle unchucking, single stock feed, and single chucking have beenperformed heretofore. y Y

I have spoken herein of feeding a double length of stock, but-by that Ido not mean to limit myself to an actual double length of stock sincethe work stop may permit only slightly more than a single length to befed, but by feeding a double length I mean that the feed device actstwice, and if the stock pedunrestrained, a double length would be Iclaim:

1. In a machine of thecharacter described, a plurality of rotatable workcarrying spindles, means for rotating the same, a main cam shaft, meansactuated thereby for performing an operation on the Work stock carriedby said rotatable spindles, cam means movable by said main cam shaft forchucking and unchucking work carried by said spindles and for feedingstock to said spindles, said cam means normally serving to chuck andunchuck and feed one length of stock for one cycle of the machine, andmeans for accelerating said chucking and feed cam means to cause thesame to chuck and unchuck and feed a length of stdck twice for eachcycle of the machine.

2. In a machine of the character described, a spindle cylinder, aplurality of spindles rotatably mounted in said cylinder, means forrotating said spindles simultaneously, chucking means for chucking workstock in said spindles, feeding means for feeding work stock, means forsimultaneously feeding work stock to all of said spindles, means forsimultaneously chucking work stock in all of said spindles, a; maincamshaft, means actuated thereby for performing operations on work stockcarried by said spindles, cam means actuated by said main cam shaft foractuating said means for chucking work stock and feeding work stock onceduring a cycle of the machine and within a predetermined period in suchcycle, and means for accelerating the action of said cam means forcausing work stock to be unchucked, stock to be fed and chucked morethan once during substantially said predetermined period during a cycleof the machine.

3. In a machine of the character described, a main cam shaft, anauxiliary cam shaft extending end to end with said main cam shaft, apinion slidably but non-rotatably mounted onsaid auxiliary cam shaft,means for nonrotatably connecting said pinion with said main cam shaftwhereby both said shafts may be caused by said pinion to rotatetogether,.an eccentrically mounted gear carried by said main cam shaft,a countershaft, an eccentrically mounted gear carried by saidcountershaft and meshing with said first mentioned eccentrically mountedgear, and a spur gear carried by said countershaft and movable with saideccentrically mounted gear thereon, said spur gear being positioned tomesh with said pinion when the latter is rotatably free of said main camshaft, for the purpose described.

4. In a machine of the character described, a main cam shaft, anauxiliary cam shaft, a pinion constantly splined to said auxiliary camshaft, means for splining said pinion to said main cam shaft when saidpinion is in one position, whereby said main and auxiliary cam shaftswill move together, a countershaft, a gear carried thereby and meshingwith said pinion when the latter is in one position, an eccentricallymounted gear carried by said countershaft and movable with said gearmeshing with said pinion, and a second eccentrically mounted gearcarried by said main cam shaft and meshing with said first mentionedeccentrically mounted gear, for the purpose described.

5. In a machine of the character described, a spindle for carrying workstock, a main cam shaft, an auxiliary cam shaft, means actuated by saidmain cam shaft'for normal- 1y unchucking and feeding one length of stockand chucking the same during a cycle of the machine, an eccentricallymounted gear carried by one of said shafts, a countershaft, aneccentrically mounted gear carried by said countershaft and meshing withsaid first mentioned ecccntrically mounted gear, a spur gear on saidcountershaft andmovable with said eccentrically mounted gear thereon,and a second spur gear movable with said auxiliary cam shaft and meshingwith said first mentioned spur gear, for the purpose described. 6. In amachine of the character described, a spindle for carrying work stock, amain cam shaft, an auxiliary cam shaft, cam means carried by the latterfor normally feeding one length of stock during a cycle of the machine,means for normally coupling said main and auxiliary cam shafts to eachother Whereby they rotate at the same speed, and means for uncouplingsaid shafts from each other and for increasing the rate of speed of saidauxiliary cam shaft relatively to said main cam shaft for causing saidcam means on said auxiliary cam shaft to feed two lengths of'stockduring a cycle of the machine.

7. In a machine of the character described, a spindle for carrying workstock, a main cam shaft, an auxiliary cam shaft, cam means actuated bysaid auxiliary cam shaft for normally feeding one length of stock withina predetermined period during a cycle of the machine, means for normallydriving said main and auxiliary cam shafts at a predetermined relativerate of speed, and change speed mechanism for accelerating the speed ofsaid auxiliary cam shaft relatively to said main cam shaft for causingsaid cam means carried by said auxiliary cam shaft to feed more than onelength of stock during substantially said predetermined period in acycle of the machine.

8. In a machine of the character described, a spindle for carrying workstock, a main cam shaft, an auxiliary cam shaft, cam means carried bysaid auxiliary cam shaft for normally unchucking work stock and feedingone length of stock, and chucking the same once during a. cycle of themachine, means normally driving said main cam shaft and auxiliary camshaft at the same rate of speed, and change speed mechanism foraccelerating the speed of said auxiliary cam shaft for causing said cammeans on the latter to unchuck and chuck work stock twice during a cycleof the machine and for feeding two lengths of stock during such cycle.

9. In a machine of the character described,

a spindle for carrying work stock, means for normall feeding one lengthof stock within a pre etermined period during a cycle of the machine,and s eed varying mechanism including a pair 0 eccentrically mountedmeshing gears for accelerating said means to cause said means to feedmore than one length of stock during substantially said predeterminedperiod during a cycle of the machine.

10. In a machine of the character described, a spindle for carrying Workstock, cam means for normally unchucking and feeding a length of stockand chucking the same within a predetermined period in a cycle of themachine, and speed varying mechanism including an eccentrically mountedgear for accelerating said cam means to cause the same to unchuck andfeed two lengths of stock within substantially said predetermined periodduring one cycle of the machine.

11. In a machine of the character described, 21 spindle for carryingwork stock, cam means for normally feeding one length of stock for eachcycle of the machine, and speed varying mechanism including aneccentrically mounted gear for accelerating said cam means to cause thesame to feed more than one length of stock during a cycle of themachine. W

'12. In a machine of the character described, a spindle carrying workstock, cam means for normally unchucking and feeding one length of stockand chucking the same within a predetermined time during a cycle ofthemachine, and means to accelerate the speed of said cam members forcausing said cam means to unchuck and feed a length of stock and chuckthe same twice durin a cycle of the machine and within substantially thesame said predetermined time.

13. In a machine of the character described, a spindle for carrying workstock,

predetermined time, and means for accelerating said means for feedingmore than one length of stock during a cycle of the machine and insubstantially the same time as one length of stock was previously fed.

14. In a machine of the character described, a spindle for carrying workstock, cam means for normally feeding one, length of work stock during acycle of the machine, and means for accelerating the speed of said cammeans for feeding more than one length of stock during a cycle ofthemachine.

15. In a machine of the character described, a spindle for carrying workstock,

means for normally feeding one length of stock during a cycle of themachine, and means for accelerating the speed of said firstmentionedmeans for causing two lengths of stock to be fed for one cycle of themachine.

. 16. In a machine ofthe character described, a main cam shaft, anauxiliary cam shaft and speed varying mechanism for connecting said maincam shaft and auxiliary cam shaft for driving said cam shafts in unisonand at variable speeds relatively to each other, and stock feeding meansactuated by said auxiliary cam shaft whereby stock may be fed rapidlythereby durin the high speed of said auxiliary cam sha relatively to thespeed of said main cam shaft.

17. In a metal working machine, a cam shaft, a cam actuated thereby, atool actuated by said cam, a stock feed cam actuated by said cam shaft,and means for driving said first mentioned cam and said stock feed camat a varying relative rate of speed whereby stock may be fed during therelatively high speed movement of said stock feed cam.

18. In a metal working machine, a main cam shaft, a stock feed camcoaxial with said main cam shaft, and means for driving said stock feedcam from said main cam shaft at a variable rateof speed relatively tothe speed of said main cam shaft whereby stock may be fed during therelatively high speed movement of said stock feed cam.

19. In a metal working machine, a main cam shaft, a plurality of camsdriven by said main camshaft, and means for causing one of said cams tobe driven at a variable rate of speed relativel to the other cams, andstock feed means riven by one of said cams whereby stock may be fedduring the relatively high speed movement of said cam.

20. In a stock feeding mechanism, a main cam shaft, a tool actuatedthereby, stock feeding means driven by said main cam shaft and actuatedcontinuously therewith, and speed varying mechanism connecting said maincam shaft and said stock feeding means for causing the latter to move ata variable rate of speed relatively to said main cam shaft duringmovement of said shafts.

21. In a stock feeding mechanism, a main cam shaft, a tool actuatedthereby, stock feeding means actuated by said main cam shaft and movablecontinuously therewith, and speed varyin mechanism connecting said maincam shaft and said stock feeding means for accelerating the movement ofstock feeding means during the stock feeding movement and while saidmain cam shaft revolves.

22. In a metal working machine, a cam shaft, a cam thereon, a toolactuated by said cam, a second cam shaft, a stock feeding cam carriedand actuated thereby, and a speed varying device connecting said camshafts for causing said shafts to rotate at variable relative ratesduring rotation of said shafts.

23. In a metal Working machine, a main cam shaft, a cam thereon, a toolactuated by said cam, a second cam shaft, a stock feeding means actuatedby said second cam shaft, and variable speed mechanism connecting mentsofsaid shafts but at a variable relative rate of speed duringmovement ofsaid shafts.

24. In a stock feeding mechanism, a cam shaft, a tool actuated thereby,stock feeding means, speed varying mechanism for connecting said camshaft and said stock feeding means, said speed varying mechanismeontinuously connecting said cam and stock feeding means whereby saidstock feeding means is accelerated during the stock feeding movement andretarded thereafter.

2-5. In a stock feeding mechanism, a stock feeding means, and variablespeed driving means for continuously driving said stock feeding means atvarious rates, whereby stock may be fed during the accelerated movementof said stock feeding means.

26. In a metal working machine, a chuck, a tool, cam means for actuatingsaid tool, cam means for actuating said chuck, a common driving meansfor said two cam means and speed varying mechanism for moving one ofsaid cam means at a variable rate relatively to the other of said cammeans while said cam means are moving whereby one of the mechanismsactuated by one of said cams may be actuated during a relatively highspeed of its cam means, while the other of said cam means is acting at arelatively slower rate.

27. In a metal working machine, a chuck, a tool, a plurality ofcoaxially mounted ca ms for actuating said tool and said chuck, andmeans for moving said cams at variable speeds relatively to each otherduring move ment of said cams whereby one of said cams may perform itsfunction while moving rapidly while the other of said cams is movingrelatively slower.

28. In a metal working machine. a chuck carrier, a plurality of chuckscarried thereby,

stock feed means, a tool carrier, means including cams for actuatingtool carrier and said stock feed means, and means for actuating saidcams' relatively to each other at variable rates of speed duringmovement of said cams.

29. In a metal working machine, a chuck, a tool, actuating means forsaid tool, actuating means for said chuck, means including separate camsfor operating-said actuating means, and means including variable speeddriving mechanism between said cams for moving the latter relatively toeach other at variable rates of speed during movement of said cams.

30. In a metal working machine, a chuck earlier, a plurality of chuckscarried thereby,

other at varyin rates of speed during move ment of both 0 said cams.

31. In a metal working machine, a chuck, a tool, means for actuatingsaid chuck, means for actuating said tool, and means including Variablespeed driving mechanism between said two last mentioned means foractuating said means relatively to each other at varying rates of speedduring actuation of both said means.

32. In a metal working machine, a chuck,

a tool, a plurality of shafts for actuating said members aforesaid, andvariable speed driving mechanism for driving said shafts at varyingrates of speed relatively to each other durin rotation of said shafts.

33. In a metal working machine, stock feed means, actuating mechanismfor said stock feed means including a driven shaft, a driving shaft,meshing gears mounted eccentrically on said shafts whereby oneofsaidshafts will be actuated at a varying rate of speed relatively tothe other of said shafts during rotation of said shafts.

34. In a metal working machine, means for actuating parts of saidmachine including three shafts, meshing gears eccentrically mounted ontwo of said shafts, meshing gears mounted on one of said two shafts andon the third said shaft whereby at least two of said shafts will berotated relatively to each other at varying rates of speed duringrotation of said shafts, and actuating mechanisms operable by at leasttwo of said shafts for actuating parts of said machine.

35. In a metal working machine, a tool, stock feed means, means foractuating said tool and stock feed means including two actuators, meansfor driving said actuators, said last mentioned means includingeccentrically mounted meshing gears whereby said actuators will beoperated at varying rates of speed relatively to each other duringoperation of said actuators.

36. In a metal working machine, a tool, stock feed means, a first camshaft, a cam thereon for actuating said tool, a second cam shaft, a camthereon for actuating said stock feed means, means for driving one ofsaid cam shafts and variable s eed gearing connecting said two shaftswhere y said second shaft will be driven by said first shaft at avariable rate of speed relatively thereto during movement of saidshafts.

37. In a metal working machine, a tool carrier, work carrying means, twocoaxial cams for actuating said tool carrier and work carrying means,and means including vari able speed driving mechanism for moving saidcams at variable rates of speed relatively to each other during movementof said cams.

38. In a metal working machine, a tool carrier, stock feed means, a pairof parallel relatively rotatable shafts, means operated by said shaftsfor actuating said tool carrier and said stock means,,and meansincluding variable speed gearing for driving said shafts at variablerates of speed relatively to each other during rotation of said shafts.39. In a metal working machine, a work carrying portion including aplurality of chucks and stock feed means, a tool carrying portion, meansfor actuating parts of said portions including two shafts, and means fordriving one of said shafts by the other of said shafts includingvariable speed mechanism whereby said shafts Will be actuated relativelyto each other at variable rates: of speed during actuation of saidshafts, said stock feed means being actuated by the driven shaftaforesaid. I

40. In a metal working machine, a tool carrier, a rotatable shaft havingmeans for advancing and retracting said tool carrier, work carryingmeans including a carrier and a plurality of chucks together with stockfeed means, a second shaft having means for actuating said stock feedmeans, said second shaft being driven by the other of said shafts bymeans including a variable speed mechanism whereby one of said shaftswill be rotated by the other of said shafts at variable rates of speedduring rotation of said two shafts.

41. In a metal Working machine, work carrying means including stock feedmeans, tool carrying means, a rotatable part for actuating said toolcarrying means, a rotatable part for actuating said stock feed means,and variable speed mechanism connecting said two rotatable parts wherebysaid parts will belrotated at variable rates of speed during rotation ofsaid rotatable parts.

'42. In a machine of the character indicated, a tool, feed meanstherefor, stock feed mechanism, and means for actuating said stock feedmechanism to cause the same to act twice during a cycle of the tool feedmeans, the second drawback of the stock feed mechanism being coincidentwith the feeding movement of the tool feed means.

1 ROBERT S. BROWN.

